{"id":744,"date":"2014-04-07T16:50:19","date_gmt":"2014-04-07T08:50:19","guid":{"rendered":"https:\/\/yanjingang.com\/blog\/?p=744"},"modified":"2016-04-07T16:51:22","modified_gmt":"2016-04-07T08:51:22","slug":"linux-shell%e8%84%9a%e6%9c%ac%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%88%aa%e5%8f%96","status":"publish","type":"post","link":"https:\/\/yanjingang.com\/blog\/?p=744","title":{"rendered":"Linux shell\u811a\u672c\u7684\u5b57\u7b26\u4e32\u622a\u53d6"},"content":{"rendered":"<p>\u5047\u8bbe\u6709\u53d8\u91cf var=http:\/\/www.google.com\/test.htm<br \/>\n\u4e00 # \u53f7\u622a\u53d6\uff0c\u5220\u9664\u5de6\u8fb9\u5b57\u7b26\uff0c\u4fdd\u7559\u53f3\u8fb9\u5b57\u7b26\u3002<br \/>\necho ${var#*\/\/}<br \/>\n\u5176\u4e2d var \u662f\u53d8\u91cf\u540d\uff0c# \u53f7\u662f\u8fd0\u7b97\u7b26\uff0c*\/\/ \u8868\u793a\u4ece\u5de6\u8fb9\u5f00\u59cb\u5220\u9664\u7b2c\u4e00\u4e2a \/\/ \u53f7\u53ca\u5de6\u8fb9\u7684\u6240\u6709\u5b57\u7b26<br \/>\n\u5373\u5220\u9664 http:\/\/<br \/>\n\u7ed3\u679c\u662f \uff1awww.google.com\/test.htm<br \/>\n\u4e8c ## \u53f7\u622a\u53d6\uff0c\u5220\u9664\u5de6\u8fb9\u5b57\u7b26\uff0c\u4fdd\u7559\u53f3\u8fb9\u5b57\u7b26\u3002<br \/>\necho ${var##*\/}<br \/>\n##*\/ \u8868\u793a\u4ece\u5de6\u8fb9\u5f00\u59cb\u5220\u9664\u6700\u540e\uff08\u6700\u53f3\u8fb9\uff09\u4e00\u4e2a \/ \u53f7\u53ca\u5de6\u8fb9\u7684\u6240\u6709\u5b57\u7b26<br \/>\n\u5373\u5220\u9664 http:\/\/www.google.com\/<br \/>\n\u7ed3\u679c\u662f test.htm<br \/>\n\u4e09 %\u53f7\u622a\u53d6\uff0c\u5220\u9664\u53f3\u8fb9\u5b57\u7b26\uff0c\u4fdd\u7559\u5de6\u8fb9\u5b57\u7b26<br \/>\necho ${var%\/*}<br \/>\n%\/* \u8868\u793a\u4ece\u53f3\u8fb9\u5f00\u59cb\uff0c\u5220\u9664\u7b2c\u4e00\u4e2a \/ \u53f7\u53ca\u53f3\u8fb9\u7684\u5b57\u7b26<br \/>\n\u7ed3\u679c\u662f\uff1ahttp:\/\/www.google.com<br \/>\n\u56db %% \u53f7\u622a\u53d6\uff0c\u5220\u9664\u53f3\u8fb9\u5b57\u7b26\uff0c\u4fdd\u7559\u5de6\u8fb9\u5b57\u7b26<br \/>\necho ${var%%\/*}<br \/>\n%%\/* \u8868\u793a\u4ece\u53f3\u8fb9\u5f00\u59cb\uff0c\u5220\u9664\u6700\u540e\uff08\u6700\u5de6\u8fb9\uff09\u4e00\u4e2a \/ \u53f7\u53ca\u53f3\u8fb9\u7684\u5b57\u7b26<br \/>\n\u7ed3\u679c\u662f\uff1ahttp:<br \/>\n\u4e94 \u4ece\u5de6\u8fb9\u7b2c\u51e0\u4e2a\u5b57\u7b26\u5f00\u59cb\uff0c\u53ca\u5b57\u7b26\u7684\u4e2a\u6570<br \/>\necho ${var:0:5}<br \/>\n\u5176\u4e2d\u7684 0 \u8868\u793a\u5de6\u8fb9\u7b2c\u4e00\u4e2a\u5b57\u7b26\u5f00\u59cb\uff0c5 \u8868\u793a\u5b57\u7b26\u7684\u603b\u4e2a\u6570\u3002<br \/>\n\u7ed3\u679c\u662f\uff1ahttp:<br \/>\n\u516d \u4ece\u5de6\u8fb9\u7b2c\u51e0\u4e2a\u5b57\u7b26\u5f00\u59cb\uff0c\u4e00\u76f4\u5230\u7ed3\u675f\u3002<br \/>\necho ${var:7}<br \/>\n\u5176\u4e2d\u7684 7 \u8868\u793a\u5de6\u8fb9\u7b2c8\u4e2a\u5b57\u7b26\u5f00\u59cb\uff0c\u4e00\u76f4\u5230\u7ed3\u675f\u3002<br \/>\n\u7ed3\u679c\u662f \uff1awww.google.com\/test.htm<br \/>\n\u4e03 \u4ece\u53f3\u8fb9\u7b2c\u51e0\u4e2a\u5b57\u7b26\u5f00\u59cb\uff0c\u53ca\u5b57\u7b26\u7684\u4e2a\u6570<br \/>\necho ${var:0-7:3}<br \/>\n\u5176\u4e2d\u7684 0-7 \u8868\u793a\u53f3\u8fb9\u7b97\u8d77\u7b2c\u4e03\u4e2a\u5b57\u7b26\u5f00\u59cb\uff0c3 \u8868\u793a\u5b57\u7b26\u7684\u4e2a\u6570\u3002<br \/>\n\u7ed3\u679c\u662f\uff1atest<br \/>\n\u516b \u4ece\u53f3\u8fb9\u7b2c\u51e0\u4e2a\u5b57\u7b26\u5f00\u59cb\uff0c\u4e00\u76f4\u5230\u7ed3\u675f\u3002<br \/>\necho ${var:0-7}<br \/>\n\u8868\u793a\u4ece\u53f3\u8fb9\u7b2c\u4e03\u4e2a\u5b57\u7b26\u5f00\u59cb\uff0c\u4e00\u76f4\u5230\u7ed3\u675f\u3002<br \/>\n\u7ed3\u679c\u662f\uff1atest.htm<br \/>\n\u6ce8\uff1a\uff08\u5de6\u8fb9\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26\u662f\u7528 0 \u8868\u793a\uff0c\u53f3\u8fb9\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26\u7528 0-1 \u8868\u793a\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5047\u8bbe\u6709\u53d8\u91cf var=http:\/\/www.google.com\/test.htm \u4e00 # \u53f7\u622a\u53d6\uff0c\u5220\u9664\u5de6\u8fb9\u5b57\u7b26 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[31],"tags":[32,363],"_links":{"self":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/744"}],"collection":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=744"}],"version-history":[{"count":0,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/744\/revisions"}],"wp:attachment":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=744"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=744"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=744"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}